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Short Crack Initiation during Low-Cycle Fatigue in SAF 2507 Duplex Stainless Steel
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Short Crack Initiation during Low-Cycle Fatigue in SAF 2507 Duplex Stainless Steel

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Abstract:

In this work, the formation of fatigue cracks is considered as a nucleation process due to the development of a characteristic microstructure formed just beneath the specimen surface. Strain controlled cyclic tests were carried out at room temperature at total strain ranges εt = 0.8 and 1.2% in flat specimens of SAF 2507 Duplex Stainless Steel (DSS). The results show that for this DSS, at εt = 0.8%, the correlation between phases (Kurdjumov-Sacks crystallographic relation) plays an important role in the formation of microcracks. On the other hand, at εt = 1.2%, microcracks initiate in the ferritic phase and the K-S relation does not seem to affect the formation of the cracks.

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Periodical:

Key Engineering Materials (Volumes 345-346)

Pages:

343-346

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.345-346.343

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Online since:

August 2007

Authors:

M.C. Marinelli, Suzanne Degallaix, I. Alvarez-Armas

Keywords:

Crack Initiation, Duplex Stainless Steel, Low Cycle Fatigue, Microstructure

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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